Datenblatt-Suchmaschine für elektronische Bauteile |
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SN74ACT7802-25FN Datenblatt(PDF) 5 Page - Texas Instruments |
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SN74ACT7802-25FN Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 15 page SN74ACT7802 1024 × 18 STROBED FIRST-IN, FIRST-OUT MEMORY SCAS187D – AUGUST 1990 – REVISED APRIL 1998 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 offset value values for AF/AE The FIFO memory status is monitored by the FULL, EMPTY, HF, and AF/AE flags. The FULL output is low when the memory is full; the EMPTY output is low when the memory is empty. The HF output is high when the memory contains 512 or more words and low when it contains fewer than 512 words. The level of the AF/AE flag is determined by both the number of words in the FIFO and a user-definable offset X. AF/AE is high when the FIFO is almost full or almost empty, i.e., when it contains X or fewer words or (1024 – X) or more words. The AF/AE offset value is either user-defined or the default value of 256; it is programmed during each reset cycle as follows: user-defined X: Take DAF from high to low. If RESET is not already low, take RESET low. With DAF held low, take RESET high. This defines the AF/AE flag using X. default X: To redefine the AF/AE flag using the default value of X = 256, hold DAF high during the reset cycle. |
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